A Brooklyn street gang member will spend 15 years to life behind bars for shooting a rival gangbanger dead as he walked out of a deli, then bragging about it on social media. Gymanni Carrington, 22, a member of the Bloods-linked Martense Beverly Bosses gang, fired a half-dozen bullets at 20-year-old Donovan Frazier in 2017 as he stepped out of a Crown Heights deli with a newly-bought ginger ...